From cygwin git on Win7 I'm trying to coordinate with my linux workstation. Both were cloned from the same upstream repository. First I do a "git fetch origin", then try to fetch from my workstation.
$ git fetch origin
[... all ok ...]
$ git fetch b
scheib@b's password:
remote: Counting objects: 2031, done.
remote: Compressing objects: 100% (512/512), done.
fatal: The remote end hung up unexpectedly
fatal: early EOFs: 23% (182/789)
fatal: index-pack failed